Servo Write Head Layout for Uniform Opposite-Polarity Servo Bars
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Solution Overview
Problem
Existing servo write heads generate unevenly distributed magnetic flux, resulting in unevenly imprinted servo patterns on magnetic tapes, which affects the accuracy of tape head positioning.
Innovation Solution
A servo write bar comprising servo write heads with a center pole surrounded by a coil, where the servo pattern is disposed over gaps between the end poles, ensuring even distribution of magnetic flux for uniform servo line imprinting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the coil is positioned around a single pole in a conventional servo write head, then the structure is simple, but the magnetic flux is unevenly distributed to the servo pattern
Solution Approach 1:
The servo write head is segmented into three separate poles (first end pole, center pole, second end pole) instead of a single pole structure. Each pole is independently spaced to create distinct gaps, allowing the magnetic flux to be evenly distributed across multiple servo lines simultaneously, thereby improving the uniformity of servo pattern imprinting.
Solution Approach 2:
Each pole is positioned with specific spacing to create localized gaps at precise locations where servo lines need to be written. The coil wrapped around the center pole generates magnetic flux that is locally directed through the gaps between poles, ensuring that each servo line receives appropriate magnetic field strength for uniform imprinting.
2Measurement precision
If a single pole structure is used, then the device complexity is low, but the positioning accuracy of tape head is affected due to uneven servo pattern imprinting
Solution Approach 1:
The write head is divided into three poles that can independently contribute to servo pattern writing. This segmentation allows each pole to be optimally positioned for writing specific servo lines, ensuring that the servo patterns are imprinted with consistent strength and accuracy, which directly improves tape head positioning precision.
Solution Approach 2:
The center pole acts as an intermediary element between the two end poles. By wrapping the coil around the center pole, the magnetic flux is generated and distributed through the gaps to both sides, ensuring balanced and accurate servo pattern imprinting on opposite sides of the tape, thereby improving positioning accuracy.
3Manufacturing precision
If the coil is disposed around the center pole with specific spacing to end poles, then the magnetic flux is evenly distributed, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies precise spacing parameters between the center pole and end poles, as well as between the coil and poles. By establishing these specific dimensional parameters, the magnetic flux distribution is optimized for uniformity. While this increases manufacturing precision requirements, it provides clear design guidelines that facilitate consistent reproduction during manufacturing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures that both servo lines of the servo pattern are imprinted at the same strength, improving the accuracy of tape head positioning and enabling efficient data reading and writing on magnetic tapes.
Implementation Method 1
Current is applied to the coil to generate magnetic flux, which then imprints a servo pattern on the tape
Implementation Method 2
The magnetic write transducer then generates a magnetic field, which encodes the data into the magnetic media
Data Source
AI summary
The present disclosure generally relates to a servo write bar comprising one or more servo write heads for writing servo patterns on a tape. Each servo write head comprises a first end pole, a second end pole, and a center pole disposed between the first and second end poles. The center pole is spaced from the first end pole by a first gap, and spaced from the second end pole by a second gap. A coil coupled to a current source is disposed around the center pole. A top surface is disposed over the center pole, and the first and second end poles. A servo pattern is disposed on the top surface over the coil. A first servo line of the servo pattern is disposed over the first gap, and a second servo line of the servo pattern is disposed over the second gap.